I have and it was well worth it. Had the bike do a slow drop in my garage and they did save the left bag. Landed on the corner and no damage to the bike or the guard.
I have them. Saved my bags several times. I put the guard bags on them. I think it looks better that way and gives me a place for small items and a water bottle.
I think they are very practical but I hate using a feather duster around them and I am not so sure I like the looks of them. I think it makes a SG look to much like a ultra.
Got them on mine, but having the bags without them ( the guards ) makes them look two globs just hanging for dear life...at least with the guards they kind of flow specially if you have the engine guards.......